Study of the Active Sites in Porous Nickel Oxide Nanosheets by Manganese Modulation for Enhanced Oxygen Evolution Catalysis

Tian Tian; Hong Gao; Xichen Zhou; Lirong Zheng; Jianfeng Wu; Kai Li; Yong Ding

doi:10.1021/acsenergylett.8b01206

journal article·2018-09-14

Study of the Active Sites in Porous Nickel Oxide Nanosheets by Manganese Modulation for Enhanced Oxygen Evolution Catalysis

Tian Tian, Hong Gao, Xichen Zhou, Lirong Zheng, Jianfeng Wu, Kai Li, Yong Ding

ACS Energy Letters· Volume 3· Issue 9

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Source abstract

Abstract

Identifying active sites of oxygen evolution reaction catalysts is essential for studying water oxidation mechanisms. Herein, the active site of nickel oxide nanosheets by manganese modulation is investigated in an electrocatalytic oxygen evolution system. The electronic structure could be realized by Mn modulation. The intrinsic catalytic activity of Ni3+ (t2g6eg1) and Jahn–Teller active Mn3+ (t2g3eg1) species act synergistically to promote the elctrocatalytic oxygen evolution reaction. X-ray absorption near-edge structure analysis indicates that the Ni3+ and Mn3+ in Ni0.75Mn0.25 nanosheets should result from nickel vacancies and oxygen vacancies, respectively. The resulting Ni0.75Mn0.25 nanosheets show much higher oxygen evolution activity than those of NiO and Mn2O3. Density functional theory calculations indicate that the Ni and Mn act synergistically to promote formation of the O–O bond. Our work provides a comprehensive understanding of the active site of porous nickel oxide nanosheets by manganese modulation and rational design of electrocatalysts with precisely engineered structures and electrical properties.

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Research context

Nanomaterials Catalysis & surfaces

OpenAlex topics: Electrocatalysts for Energy Conversion · Advanced battery technologies research · Advanced Memory and Neural Computing

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

State Key Laboratory of Applied Organic Chemistry, Key Laboratory of Nonferrous Metals Chemistry and Resources Utilization of Gansu Province, and College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, China

Beijing Synchrotron Radiation Facility, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China

State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China

State Key Laboratory for Oxo Synthesis and Selective Oxidation, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China

Funding

Ministry of Education of the People's Republic of China · National Natural Science Foundation of China · Natural Science Foundation of Gansu Province · State Key Laboratory of Rare Earth Resource Utilization

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